We haven't seen many Hillary staffers join the Obama campaign yet, but Team Obama has now tapped a Hillary communications staffer and installed him in a key post in the crucial swing state of Ohio -- continuing Obama's rapid buildup of staff in the battleground states.

Isaac Baker, a Hillary spokesperson in Ohio throughout the primary, has joined Camp Obama as the Ohio director of communications. "We're building a strong field organization that will bring this campaign to all 88 counties," Baker IMs me.

Baker is the second Hillary staffer to jump to Team Obama after Hillary campaign manager Patti Solis Doyle recently joined as the chief of staff to the as-yet-unselected Veep. While Doyle's obviously a higher level staffer than Baker, the lead Ohio press gig is the sort of low-profile post that can matter, given the state's obvious importance in the general and given how bitterly contested it's likely to be.